“…The biosynthesis of AGP glycans requires at least 10 functionally distinct enzymes, e.g., galactosyltransferases (GALTs), arabinosyltransferases, fucosyltransferases (FUTs), rhamnosyltransferases, xylosyltransferases, glucuronosyltransferases 1 http://www.cazy.org (GLCATs), and glucuronic acid methyltransferases. To date, 22 transferases responsible for AGP glycosylation have been identified in Arabidopsis (Tables 1 and 2): eight hydroxyproline-O-β-GALTs (Hyp-O-GALTs; AtGALT2, AtGALT3, AtGALT4, AtGALT5, and AtGALT6, Basu et al, 2013Basu et al, , 2015aShowalter and Basu, 2016;AtHPTG1, AtHPTG2, and AtHPTG3, Ogawa-Ohnishi and Matsubayashi, 2015), two β-1,3-GALTs (At1g77810, Qu et al, 2008 andAtKSN4, Suzuki et al, 2017), two β-1,6-GALTs (AtGALT31A, Geshi et al, 2013 and AtGALT29A;, five β-1,6-GLCATs (AtGLCAT14A, AtGLCAT14B, AtGLCAT14C, AtGLCAT14D, and AtGLCAT14E, Knoch et al, 2013;Lopez-Hernandez et al, 2020;Zhang et al, 2020), two α-1,2-FUTs (AtFUT4 and AtFUT6, Wu et al, 2010;Liang et al, 2013;Tryfona et al, 2014), a putative β-arabinosyltransferase (AtRAY1, Gille et al, 2013), and two glucuronic acid methyltransferases (AtAGM1 and AtAGM2, Temple et al, 2019; Figure 3). However, several enzymes remain to be identified, including α-arabinofuranosyltransferases, β-arabinopyranosyltransferases, α-rhamnosyltransferases, α-xylosyltransferases, an α-GALTs, and other β-GALTs, β-GLCATs, α-FUTs, and glucuronic acid methyltransferases.…”